October in Atherton is the windiest month of the year. In October, the weather in Atherton is typically warm. Average daily high temperature in October is about 24 degrees above zero. On average, Atherton has 13 partly cloudy, 11 sunny, 4 rainy, and 3 cloudy days in October. The rains are usually light. October as well as August and September is considered the most comfortable time to visit Atherton.